My eggs are fertile. I have been checking the yolks and they all have the little white bullseye on them showing that they have definitely been fertilized. But, I put some under my broody and also gave some away for free on here, and people are telling me that their eggs aren't growing. Sure enough, I checked my broody's eggs last night (day 7 under her) and there was no sign of life or growth. What happened? Why are these eggs fertile but not growing? What did I do wrong, and how do I fix it? Any insight would be wonderful because I'm really confused. Thank you.